Consider the ElGamal signature scheme. Let Bob’s private key be Kpr = (d) = (67) and the corresponding public key Kpub = (p, α, β) = (97,23,15). Verify if both these messages originated from Bob You receive the following message and signatures (x, r, s) = (22, 37, 33) (x, r, x) = (82, 13, 65)

Q: se Alice computes the Secret suffix MAC (page 322: secret suffix MAC(x) = h(x || key)) for the…

A: There is no encryption performed by Alice. Therefore the information sent by alice is FMC

Q: Suppose your RSA public key is PK: {n, e} = {13861, 37}. Your friend sends you a ciphertext C =…

A: a) n=13861(given)e=37n=p*qn=167*83 b) e=37(given) RSA uses the Euler φ function of n to calculate…

Q: Suppose Alice computes the Secret suffix MAC (page 322: secret suffix MAC(x) = h(x || key)) for the…

A: There is no encryption performed by Alice. Therefore the information sent by alice is FMC

Q: In the context of the ElGamal signature, the public key is (257, 76, x), where "x" is not known to…

A: Yes there a re-use of the ephemeral key  The ElGamal signature scheme allows that a verifier can…